QST3000D chain saw machine on backhoe CAT432 is the last frontier for squaring blocks of marble and stones. QST3000D technology is driven by the very powerful motor of CAT432 and the hydraulic circuit for moving the chain saw was studied together with Caterpillar technicians and our technical staff.The advantages of this technology are a lot o : i.e. you can work day and night and in every weather conditions because the operator inside the cabin can decide the temperatures; you can work without using water ,etc...

QST3000D works with CAT432 for positioning the blade using the control tools inside the cabin and you can modify the inclination using the stabilizers of backhoe; it's also possible to drive the chain saw trough a remote control outside the cabin.

All movements for positioning the blade are on double chromate columns allows to have stability and stiffness; this system is unique and only Dazzini QST3000D use it; all movements are driven by single or double hydraulic cylinders (high reliability, simple and no maintenance costs).

At the end of the cuts, with CAT432 is possible to remove the cuts' dust with only one operator with high safety and speed. CAT432 is 4x4 engine and it can move very easily between quarry's benches for reaching the blocks and starting to square, avoiding to use any other machines.

QST3000D can use different chain, widiaholders and tools for giving the best cutting solutions for every kind of stones.

Crawler-type chain saw is the enhanced one of orbital-type chain saw,the biggest characteristic of the machine is equipped with a pedrail walking itself,moving conveniently and flexibly. The machine host and pedrail move alternately in working , which don't need to cooperate with other hoisting machinery moving track, suitable for outdoor use in mines. Each machine can be designed to have two kinds of working model--- vertical and horizontal cutting.

The chain saw model CST 965 is a cutting chain mounted on the rear of a wheeled tractor cab, called Terna.

The machine is self powered and is autonomous both in handling and positioning. It can perform vertical cuts up to the maximum depth of 3.25 meters on marble, limestone and stone materials of similar hardness. The machine is ideal for squaring blocks and for the making series of front cuts.

Arms and chains are available for cutting up to 3.25 meters.

Our company offers the possibility to mount the following chains in order to optimize cutting performance on different materials:

chains 38/40/42 mm with 8 edges tools

42 mm chain with 4 edges tools ;

38/40/42 mm chain with PCD tools for hard stones

TECHNICAL FEATURES

Terna CST 965

Arm rotation 90°

Vertical stroke 3000 mm

Orizontal stroke 2000 mm

Available lenghts of arm (Useful cut) da/from 2 m – a/to 3.25 m

Cut width 38-40-42 mm

Weight of cutting unit 3500 kg

Total weight, including tractor 10.000 kg

Grease tank capacity 7 kg

Grease capacity 0,3 – 1 kg

Hydraulic oil tank capacity 150 litri / litres

Diesel comsumption 7 – 10 l/h

Round per minutes of the chain rotation pinion 65 rpm

Round per minutes of the diesel engine 1400-1500 rpm

Rear gear movement maximum slope 21%

Accessories for chain saw

VACUUM

Vacuum designed to remove large quantities of dust and of the waste granular material produced by the chain saw cutting.

The waste material is removed from the accumulation zone adjacent to the cut by means of a fl exible hose and of a suction cup.

The vacuum can be installed on a trailer moving on the rails along with the chain saw.

The waste material is deposited on the ground, in the opposite side of the cut.

WORM

Worm designed to carry and to remove automatically large quantities of dust and of the waste granular material produced by the chain saw cutting.

The cut waste material is carried in the feed-box of the worm, and then deposited on the ground, at 2 meters distance from the cut.

Chain saw on which all drives are electric and controlled by Inverters. The higher energy efficiency with respect to hydraulic systems and the specific tool arrangement offer significantly better cutting speeds and tool life.

A modern heavy-duty chain saw for sedimentary stone quarries,where the machine can perform cuts both vertical and horizontal.

The machine is driven entirely by electric motors to reduce energy demand (due to the higher efficiency with respect to hydrostatic transmissions) also eliminating maintenance problems typical of hydraulic circuits.

The machine consists of the following main parts:

Frame

The welded steel frame is extremely rigid in both torsion and bending to ensure the absence of deformation guaranteeing limited mechanical loads on the cutting arm and long tool life.

Main Motor

The main 30 kW motor operating at variable speed under the control of an Inverter, driving the chain itself, through an epicycloid gearbox.

The blade rotation system, also with a variable speed motor (Inverter controlled) and an irreversible double worm and crown gearbox for blade rotation;

The motorised blade-swing system, with a 0,75 kW Motor that positions

the blade horizontally or vertically.

Variable speed 3 kW motor with a speed reducer and rack and pinion system, to drive the machine along the track.

A pump set for blade pinion and chain lubrication, with 0,25 Kw motor

Electric panel

The electric panel and switchboard with controls and commands with emergency machine stop in case of anomalies.

- a set of inverters for the main motors - a cutting speed control system

- all manual and automatic controls - current absorption on all motors control system - safety and emergency protection devices

Blade

Available in lengths suitable for cutting depths from 2 to 5.6 m, the blade is in special high strength and wear-resistant steel. The blade incorporates channels for both lubricant pipework and for cooling water or air.

The blade edges are machined and drilled to house the wear-plates on which the chain runs during cutting; these replaceable plates are in hardened and tempered steel.

Chain

The special steel chain consists of 8 tool-carrier links. The first 5 links carry one tool, while the others each have two in stepped positions.

This patented arrangement offers high cutting speeds and the best possible resistance to tool wear and breakage. The tools are normally in Tungsten Carbide size 12,7 x 12,7 x 6,5mm and are fastened by a screw so that each tool can be used up to eight times

Track (Rail)

Three tracks are provided (more on request) each of 3m length, and complete with anchoring systems to fasten the machine to the quarry floor.

The three-track system allows continuous machine operation; when track 2 is reached, track 1 can be placed ahead of track 3, with no need to stop the machine.

Walking beam type track

A "walking beam" version is also available with a single track of length 7.5m, allowing 5m travel. Using hydraulic cylinders, the machine can be lifted with the track, the latter then being shifted ahead to continue cutting, with no need for other lifting gear.

A large increase in quarry output can be achieved by combining the use of a chain saw and diamond wire saws.

Orbital-type chain saw is the most basic type,the rails used interchangeably in working, suitable for open-pit mine,each machine can be designed to have two working mode--- vertical and horizontal cutting; Orbital-type chain saw can be designed into the single rail longitudinal mobile model.

Cavern-type chain saw is special for marble hole mining, crawler walking conveniently and flexibly, its orbit can rotate 270 degrees, which has 4 kinds of working model---horizontal cutting(cutting the top of ceiling and ground),vertical cutting(cutting left side of the facade and the right side of the facade),suitable for the quarries with high steep slope and can't excavate mountain skin layer and do overburden stripping.